You need 4.0 ounces of a steroid ointment. if there are 16 oz in 1 lb, how many grams of ointment does the pharmacist need to prepare

The given units are the units of masses which are interconvertable.

It is given that:

Now, converting :

Since,

So,

Now converting :

Since, 1 kg = 1000 g

So,

For :

Thus, of ointment needed to be prepared by the pharmacist.

since electrons are negative the answer is neagtaive